IPv6 White Paper

ARIN Letter to AT&T Regarding IPv4 Depletion

Executive Summary

The American Registry for Internet Numbers (ARIN) estimates that IPv4 will
be depleted within two years. ARIN is taking steps to ensure the legitimacy of
all future IPv4 requests, and recommends making your organization's publicly
accessible resources (e.g., external Web servers and e-mail servers) available
via IPv6 as soon as possible.